package org.cboard.security.utils;

import org.cboard.dto.User;

import java.security.MessageDigest;

public class MD5Util {
    /***
     * MD5加码 生成32位md5码 
     */
    public static String string2MD5(String inStr) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++)
            byteArray[i] = (byte) charArray[i];
        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16)
                hexValue.append("0");
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();

    }

    /**
     * 加密解密算法 执行一次加密，两次解密
     */
    public static String convertMD5(String inStr) {

        char[] a = inStr.toCharArray();
        for (int i = 0; i < a.length; i++) {
            a[i] = (char) (a[i] ^ 't');
        }
        String s = new String(a);
        return s;

    }

    /**
     * 根据登陆的用户的信息比对数据库中的用户的密码信息
     *
     * @param userName
     * @param password
     * @param user
     * @return
     */
    public static boolean verifyingUserDetailByNameAndPassword(String userName, String password, User user) {
        boolean passed = false;
        if (user != null) {
            String passwordUserLoginMd5Encoded = MD5Util.string2MD5(password);
            return passwordUserLoginMd5Encoded.equals(user.getPassword());
        }
        return passed;
    }

    // 测试主函数  
    public static void main(String args[]) {
        String s = new String("watersys");
        System.out.println("原始：" + s);
        System.out.println("MD5后：" + string2MD5(s));
        System.out.println("加密的：" + convertMD5(s));
        System.out.println("解密的：" + convertMD5(convertMD5(s)));

        String passowrd = "root123";
        System.out.println("MD5后 ： " + string2MD5(passowrd));
    }
}
